The 8 inch Round Back Static Roof Vent is 8 inches in diameter and has a 4 inch tall collar. In other words, this vent has 4 inches of clearance between the base and the inner louvers. The model RBV-8-C4 has 50 inches of net free area (NFA) which means each vent will ventilate 208 square feet of attic space.
This 8 inch roof vent is ideal for roofs with a 3/12 to 12/12 roof pitch. For a pitch of 3/12 or greater, install this vent no more than 3 feet from the ridge of the roof. Doing this will enable you to install your static vent in all climate zones.
The Round Back Static Roof Vents will remove radiant heat in the summer from the attic. It will also remove moisture from the attic in the winter. As a result, making these the ultimate solution for ventilating residential attics year-round. Ventilation helps to make a home more comfortable and energy efficient.
The vent lid is manufactured from one piece of spun aluminum which prevents rain and snow from entering the attic. The round design is aerodynamic to withstand wind pressure exceeding 200 mph. All Round Back roof vents are resistant to corrosion and will remain rust free for the life of the roof.
The inner louvers of the roof vent keep insects and animals from entering the attic. The louvers also allow the air to flow freely to the outside.
This 8 inch roof vent is also great for residential roof applications because of its aesthetically pleasing appearance. Having a low profile, the Round Back Vents can also be painted to match the color of asphalt shingle roofs.
AVP’s Round Back Static Vents are UL Listed and rated up to 50+ PSF or wind pressure above 200 MPH. Certified by Texas Department of Insurance, Florida State Approved & Conforms to the Standards of CALFIRE.
The diameter size of all roof vents determines the Net Free Area, also known as the "NFA". NFA is the measured amount of opening each vent offers at each specific size. to be available for venting air through a specific vent size. The calculator below will find the overall number of vents needed to effectively ventilate the targeted attic space.
Once you have the area, the numbers shown below are the number of vents of that size which would ventilate the specified area with both 1/300 and 1/150 rule.
The roof vent calculation values shown above are for the exhaust portion of the roof. The same amount of net free air inches is needed for air intake as well. Proper roof ventilation consists of 50% air exhaust and 50% air intake.